On Oct 14, 2011, at 10:38 AM, Lloyd Kvam wrote:
Would it make sense to add a __nonzero__ method to ResultProxy that
was tied to the rowcount?
def __nonzero__(self):
return bool(self.rowcount)
This would allow code like
if results:
process(results)
I was surprised when this did not work.
this is because .rowcount is not related to the count of rows in a result set.
Some DBAPI's may do this, but this is not the intent of .rowcount and is not
supported on most. .rowcount is only intended to describe the number of rows
matched by an UPDATE or DELETE statement.
The only way to know if there are any rows in a result set are to fetch them.
The cursor itself, based on backend, doesn't even know there's a row until it
sends a message to the database to get the first row.
Therefore you have to use fetchone() to check for a row.
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